Factor −20x² + x + 12.

Answers

The answer is -(5x-4)(4x+3) Factor out a negative from the entire expression    −20x² + x + 12     =  −(20x² - x - 12) Find two numbers so that they    ⇒ Multiply to get 20 * -12 = -240    ⇒ and add to get -1 (coefficient on x term) These two numbers are -16 and 15 (not very obvious; might have to crunch some numbers) We can break down the x term using -16 and 15 as coefficients on x    −(20x² - x - 12)    = −(20x² - 16x + 15x - 12) We factor by grouping. Factor 4x out of 20x² - 16x and 3 out of 15x - 12 to get    = −[ 4x(5x - 4) + 3(5x - 4) ] Factor out (5x-4) to get    = -(5x-4)[4x + 3]    = -(5x-4)(4x+3)


0 0
Only authorized users can leave an answer!
Can't find the answer?

If you are not satisfied with the answer or you can’t find one, then try to use the search above or find similar answers below.

Find similar answers


More questions